package com.gocoolmall.search.service.impl;

import com.alibaba.fastjson.JSON;
import com.gocoolmall.common.to.es.SkuEsModel;
import com.gocoolmall.search.config.GocoolmallElasticSearchConfig;
import com.gocoolmall.search.constant.EsConstant;
import com.gocoolmall.search.service.MallSearchService;
import com.gocoolmall.search.vo.SearchParam;
import com.gocoolmall.search.vo.SearchResult;
import org.apache.lucene.search.join.ScoreMode;
import org.elasticsearch.action.search.SearchRequest;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.index.query.BoolQueryBuilder;
import org.elasticsearch.index.query.NestedQueryBuilder;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.index.query.RangeQueryBuilder;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.SearchHits;
import org.elasticsearch.search.aggregations.AggregationBuilders;
import org.elasticsearch.search.aggregations.bucket.nested.NestedAggregationBuilder;
import org.elasticsearch.search.aggregations.bucket.nested.ParsedNested;
import org.elasticsearch.search.aggregations.bucket.terms.ParsedLongTerms;
import org.elasticsearch.search.aggregations.bucket.terms.ParsedStringTerms;
import org.elasticsearch.search.aggregations.bucket.terms.Terms;
import org.elasticsearch.search.aggregations.bucket.terms.TermsAggregationBuilder;
import org.elasticsearch.search.builder.SearchSourceBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightField;
import org.elasticsearch.search.sort.SortOrder;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.util.StringUtils;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;

@Service
public class MallSearchServiceImpl implements MallSearchService {


    @Autowired
    private RestHighLevelClient client;
    //去es进行检索
    @Override
    public SearchResult search(SearchParam param) {
        //1、动态构建查询需要的DSL语句
        SearchResult result= null;
        //1、准备检索请求
        SearchRequest searchRequest = buildSearchRequrest(param);

        try {
            //2、执行检索请求
            SearchResponse response = client.search(searchRequest, GocoolmallElasticSearchConfig.COMMON_OPTIONS);
            //3、分析响应数据封装成我们需要的格式
            result =buildSearchResult(response,param);
        } catch (IOException e) {
            e.printStackTrace();
        }
        return result;
    }

    /**
     * 准备请求数据
     * 模糊匹配，过滤（按属性，分类，品牌，价格期间，库存），排序，分页，高亮，聚合分析
     * @return
     */
    private SearchRequest buildSearchRequrest(SearchParam param) {
        SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();//构建DSL语句

        /**
         * 查询：模糊匹配，过滤（按照属性、分类、品牌、价格区间、库存）
         */
        //1、构建bool、query
        BoolQueryBuilder boolQuery = QueryBuilders.boolQuery();
        //1.1 must-模糊匹配
        if (!StringUtils.isEmpty(param.getKeyword())) {
            boolQuery.must(QueryBuilders.matchQuery("skuTitle",param.getKeyword()));
        }
        //1.2 bool - filter  按照三级分类id查询
        if (param.getCatalog3Id() != null) {
            boolQuery.filter(QueryBuilders.termQuery("catalogId",param.getCatalog3Id()));
        }
        //1.2 bool -filter --按照品牌id查询
        if (param.getBrandId()  != null && param.getBrandId().size() > 0) {
            boolQuery.filter(QueryBuilders.termQuery("brandId",param.getBrandId()));
        }
        //1.2 bool -filter --按照指定商品属性进行查询
        if (param.getAttrs() != null && param.getAttrs().size() > 0) {
            for (String attrStr: param.getAttrs()){
                //attrs=1_5寸：8寸  & attrs=2_16G:8G
                BoolQueryBuilder nestedBoolQuery = QueryBuilders.boolQuery();
                //attr1_5寸：8寸
                String[] s = attrStr.split("_");
                String attrId =s[0];
                String[] attrValues = s[1].split(":");
                nestedBoolQuery.must(QueryBuilders.termQuery("attrs.attrId",attrId));
                nestedBoolQuery.must(QueryBuilders.termQuery("attrs.attrValue",attrValues));
                //每个必须都得生成一个nested查询
                NestedQueryBuilder nestedQuery = QueryBuilders.nestedQuery("attrs", nestedBoolQuery, ScoreMode.Max);
                boolQuery.filter(nestedQuery);
            }
        }

        //1.2bool - filter 按照库存是否有进行查询
        if (param.getHasStock() != null) {
            boolQuery.filter(QueryBuilders.termQuery("hasStock",param.getHasStock() == 1 ));
        }
        //1.2bool - filter 按照价格区间
        if (!StringUtils.isEmpty(param.getSkuPrice())){
            //1_500 /_500/500_
            /**
             * "range":{
             *      "skuPrice":{
             *          "gte":0,
             *          "lte":6000
             *      }
             * )
             */
            RangeQueryBuilder rengeQuery = QueryBuilders.rangeQuery("skuPrice");
            String[] s = param.getSkuPrice().split("_");
            if (s.length == 2){
                rengeQuery.gte(s[0]).lte(1);
            }else if (s.length ==1){
                if (param.getSkuPrice().startsWith("_")){
                    rengeQuery.lte(s[0]);
                }
                if (param.getSkuPrice().endsWith("_")) {
                    rengeQuery.gte(s[0]);
                }
            }
            boolQuery.filter(rengeQuery);
        }

        //把以前的所以条件都拿来进行封装
        SearchSourceBuilder query = sourceBuilder.query(boolQuery);

        // 2  排序，分页，高亮
        //2.1 排序
        if (!StringUtils.isEmpty(param.getSort())) {
            String sort = param.getSort();
            //sort = hotScore_asc/desc
            String[] s = sort.split("_");
            SortOrder order = s[1].equalsIgnoreCase("asc")? SortOrder.ASC:SortOrder.DESC;
            sourceBuilder.sort(s[0],order);
        }
        //2.2分页
        //pageNum:1 from:0  size:5   [0,1,2,3,4]
        //pageNum:2 from:2  size:5
        //from=（pageNum-1）*size
        if (param.getPageNum() != null) {
            sourceBuilder.from((param.getPageNum()-1)*EsConstant.PRODUCT_PAGESIZE);
            sourceBuilder.size(EsConstant.PRODUCT_PAGESIZE);
        }

        //2.3高亮
        if (!StringUtils.isEmpty(param.getKeyword()) ) {
            HighlightBuilder highlightBuilder = new HighlightBuilder();
            highlightBuilder.field("skuTitle");
            highlightBuilder.preTags("<b style='color:red'>");
            highlightBuilder.postTags("</b>");
            sourceBuilder.highlighter(highlightBuilder);
        }

        //聚合分析
        //3.1品牌聚合
        TermsAggregationBuilder brand_agg = AggregationBuilders.terms("brand_add");
        brand_agg.field("brandId").size(50);
        //品牌聚合的子聚合
        brand_agg.subAggregation(AggregationBuilders.terms("brand_name_agg").field("brandName").size(1));
        brand_agg.subAggregation(AggregationBuilders.terms("brand_img_agg").field("brandImg").size(1));
        sourceBuilder.aggregation(brand_agg);

        //3.2分类聚合
        TermsAggregationBuilder catalog_agg = AggregationBuilders.terms("catalog_agg").field("catalogId").size(20);
        catalog_agg.subAggregation(AggregationBuilders.terms("catalog_name_age").field("catalogName").size(1));
        sourceBuilder.aggregation(catalog_agg);

        //3.3属性聚合
        NestedAggregationBuilder attr_agg = AggregationBuilders.nested("attr_agg", "attrs");
        //聚合出当前所有的attrId
        TermsAggregationBuilder attr_id_agg = AggregationBuilders.terms("attr_id_agg").field("attrs.attrId");
        //聚合分析出当前attr_id对应的名字
        attr_id_agg.subAggregation(AggregationBuilders.terms("attr_name_agg").field("attrs.attrName").size(1));
        //聚合分析出当前attr_id对应的所有可能的属性值attrValue
        attr_id_agg.subAggregation(AggregationBuilders.terms("attr_value_agg").field("attrs.attrValue").size(50));
        attr_agg.subAggregation(attr_id_agg);

        sourceBuilder.aggregation(attr_agg);

        System.out.println("构建的DSL:"+sourceBuilder.toString());

        SearchRequest searchRequest = new SearchRequest(new String[]{EsConstant.PRODUCT_INDES}, sourceBuilder);
        return searchRequest;
    }

    /**
     *构建结果数据
     * @param response
     * @return
     */
    private SearchResult buildSearchResult(SearchResponse response , SearchParam param) {
        //
        SearchResult result = new SearchResult();
        //1.返回的所有查询到的商品
        SearchHits hits = response.getHits();
        List<SkuEsModel> esModels = new ArrayList<>();
        if (hits.getHits() != null && hits.getHits().length > 0) {
            for (SearchHit hit:hits.getHits()) {
                String sourceAsString = hit.getSourceAsString();
//                SkuEsModel skuEsModel = new SkuEsModel();
                SkuEsModel skuEsModel = JSON.parseObject(sourceAsString, SkuEsModel.class);
                if (!StringUtils.isEmpty(param.getKeyword())){
                    HighlightField skuTitle = hit.getHighlightFields().get("skuTitle");
                    String string = skuTitle.getFragments()[0].string();
                    skuEsModel.setSkuTitle(string);
                }
                esModels.add(skuEsModel);
            }
        }
        System.out.println("查询到的商品:"+esModels);
        result.setProducts(esModels);

        //2、当前所以商品涉及到的所有属性信息
        List<SearchResult.AttrVo> attrVos = new ArrayList<>();
        ParsedNested attr_agg = response.getAggregations().get("attr_agg");
        ParsedLongTerms attr_id_agg = attr_agg.getAggregations().get("attr_id_agg");
        for (Terms.Bucket bucket : attr_id_agg.getBuckets()) {
            SearchResult.AttrVo attrVo = new SearchResult.AttrVo();
            //1、得到属性的id
            long attrId = bucket.getKeyAsNumber().longValue();
            //2、得到属性的名字
            String attrName = ((ParsedLongTerms) bucket.getAggregations().get("attr_name_agg")).getBuckets().get(0).getKeyAsString();
            //3、得到属性的所有值
            List<String> attrValue = ((ParsedLongTerms) bucket.getAggregations().get("attr_value_agg")).getBuckets()
                    .stream().map(item ->{
                        String keyAsString = ((Terms.Bucket) item).getKeyAsString();
                        return keyAsString;
                    }).collect(Collectors.toList());
            attrVo.setAttrId(attrId);
            attrVo.setAttrName(attrName);
            attrVo.setAttrValue(attrValue);
            attrVos.add(attrVo);
        }
        System.out.println("所有属性:"+attrVos);
        result.setAttrs(attrVos);

        //3、当前所有商品涉及到的所有品牌信息
        List<SearchResult.BrandVo> brandVos = new ArrayList<>();
        ParsedLongTerms brand_add = response.getAggregations().get("brand_add");
        System.out.println("brand_add:::::"+brand_add);
        for (Terms.Bucket bucket :brand_add.getBuckets()) {
            SearchResult.BrandVo brandVo = new SearchResult.BrandVo();
            //1、得到品牌的id
            Long brandId = bucket.getKeyAsNumber().longValue();
            brandVo.setBrandId(brandId);
            //2、得到品牌的名字
            String brandName = ((ParsedStringTerms) bucket.getAggregations().get("brand_name_agg")).getBuckets().get(0).getKeyAsString();
            brandVo.setBrandName(brandName);
            //3、得到品牌的图片
            String brandImg = ((ParsedStringTerms) bucket.getAggregations().get("brand_img_agg")).getBuckets().get(0).getKeyAsString();
            brandVo.setBrandImg(brandImg);

            brandVos.add(brandVo);
        }
        System.out.println("品牌信息"+brandVos);
        result.setBrands(brandVos);

        //4、当前所有商品涉及到的所有分类信息
        ParsedLongTerms catalog_agg = response.getAggregations().get("catalog_agg");
        List<? extends Terms.Bucket> buckets = catalog_agg.getBuckets();
        ArrayList<SearchResult.CatalogVo> catalogVos = new ArrayList<>();
        for (Terms.Bucket bucket : buckets) {
            SearchResult.CatalogVo catalogVo = new SearchResult.CatalogVo();
            //得到分类id
            String keyAsString = bucket.getKeyAsString();
            catalogVo.setCatalogId(Long.parseLong(keyAsString));
            //得到分类名
            ParsedStringTerms catalog_name_agg = bucket.getAggregations().get("catalog_name_age");
            String catalog_name = catalog_name_agg.getBuckets().get(0).getKeyAsString();
            catalogVo.setCatalogName(catalog_name);
            catalogVos.add(catalogVo);
        }
        System.out.println("catalogVos:"+catalogVos);
        result.setCatalogVos(catalogVos);

        /*=================以上从聚合信息中获取==========================*/
        //5、分页信息-页码
        result.setPageNum(param.getPageNum());
        //5、分页信息-总记录树
        long total =hits.getTotalHits().value;
        result.setTotal(total);
        //5、分页信息-总页码数 11/2=5...1
        int totalPages = (int)total%EsConstant.PRODUCT_PAGESIZE==0
                ? (int)total/EsConstant.PRODUCT_PAGESIZE:((int)total/EsConstant.PRODUCT_PAGESIZE+1);
        result.setTotalPages(totalPages);

        List<Integer> pageNavs = new ArrayList<>();
        for (int i =1 ; i<= totalPages; i++){
            pageNavs.add(i);
        }
        result.setPageNavs(pageNavs);
        System.out.println("总页码数:"+totalPages+"总记数："+total+"");
        System.out.println("搜索out:"+result);

        return result;
    }
}
